I'm guessing that you just have very fine stuff in your pool.
1)Did you make sure you are using filter sand and not something else?
2) You can try adding a cup of DE through your skimmer until your pressure goes up about a pound. This will get the water clearer as well.
3) "Skimmer Socks" are elastic filters that go in the skimmer, like a filter in a Mr. Coffee coffee maker. They are very fine as well. They are not expensive and most pool store have them or the equivalent brand.
4) a "Slime Bag" is an auxiliary filter that catches finer stuff. They are a bit pricey--the $80 range I believe, but I gather they work and work well.
5) Do you have a friend with a Dolphin Dynamic, AquaBot or equivalent robot who would lend it to you for a couple of cycles? They pump all the pool's water through their EXTREMELY fine filter bag, effectively "polishing" the water.
This is assuming there isn't something else wrong, but your numbers don't indicate it.
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